[en] Hybrid magnets can achieve substantially higher fields than those available in superconducting magnets, but their spatial homogeneity and temporal stability are unacceptable for high-resolution NMR. To overcome this disadvantage, various methods have been examined. The detection of intermolecular zero-quantum coherences is proposed for the removable of the effects of inhomogeneity and drift. Ferromagnetic inserts combined with feedback control of power supply and NMR reference deconvolution can be used to obtain well-resolved solid-state NMR. In this report, two methods for compensating effect of field fluctuation were examined to attain high-resolution NMR spectra with a hybrid magnet. In one method, time dependence of electromotive force induced for a pickup coil attached near a sample was measured synchronously with acquisition of NMR. Observed voltage across the picked coil was converted to field fluctuation data, which was used to deconvolute NMR signals. This method was applied to ⁷⁹Br Magic Angle Spinning (MAS) NMR or KBr under a 30T magnetic field. More precise reference signal was required for NMR spectra of liquids because of sharp lines. The other method was developed by using the phase angle of NMR spectrum caused by field fluctuation. Trial experiment by the latter method was performed with the two nuclei probes attaching a coil artificially generating field fluctuation. The sample used in this experiment was a mixture of a small amount of ethyl benzene in benzene d₆. (Y. Kazumata)